Wrapcandy Poster Maker lets you turn your digital photo into a poster and print it out on your printer from home. Put it together and frame it and it is a wonderful piece of art. It also has some editing tools, one of the best ones is the ability to take a color photo, trace around an area you want to keep in color (eg a hat, or a flower) and turn the rest black and white. Note, a free account registration is needed to activate the software. It is simple and the link is in the readme file.
More info and download from